This paper presents our investigation into a 220‐GHz signal monitoring system. The detectable frequency band of the proposed system is 220 to 230 GHz with the ability to distinguish mirror frequency. The detectable signal ranging from one tone signal to 1 GHz and the frequency accuracy is 1 KHz. More importantly, the terahertz monitoring system can accurately estimate the center frequencies of monotone signals and common modulation signals. The modulation methods including BPSK, QPSK, 8PSK, 16QAM, 32QAM, and 64QAM. The front end of the receiver consists of a 220‐GHz subharmonic mixer and a 110‐GHz tripler that are based on Schottky diodes. Both the mixer and the tripler show great performance and guarantees the well operation of the monitoring system. In addition, the baseband algorithm is modified to improve efficiency and reduce computation. The experiment of signal detection shows the system can identify the frequency, power, bandwidth, and the modulation mode of the unknown signal during the operation band.

中文翻译：

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220GHz信号检测系统的研究

本文介绍了我们对220 GHz信号监视系统的研究。所提出系统的可检测频带为220至230 GHz，具有区分镜像频率的能力。可检测的信号范围从一个音调信号到1 GHz，频率精度为1 KHz。更重要的是，太赫兹监视系统可以准确估计单调信号和公共调制信号的中心频率。调制方法包括BPSK，QPSK，8PSK，16QAM，32QAM和64QAM。接收器的前端由一个基于肖特基二极管的220 GHz次谐波混频器和一个110 GHz三重器组成。混频器和三频器均显示出出色的性能，并保证了监控系统的良好运行。另外，修改了基带算法以提高效率并减少计算量。